Apparatus for heating and cooling liquids



May 20, 1930.

F. G. CORNELL. JR

APPARATUS FOR HEATING AND COOLING LIQUIDS 2 Sheets-Sheet l A rw-ITE.

4Filed May 27, 1926 May 20, i1930.l F. G. CORNELL, JR l y1,759,440

APPARATUS FOR HEATING AND COOLING LIQUIDS vFiled May 27. 192e 2 sheets-snapt 2 A TTURNEYS i UNITED .STATES Patented May 20, 1930 PATENT OFFICE FRITZ e. CORNELL, JR., or CALDWELL, NEW JERSEY, AssIGNoR, BYvMEsNE'AssIGN- MENTS, To JENSEN CREAMERY MACHINERY CoMPANIaINC., 0E BLooMFI'ELD, NEW

JERSEY, A CORPORATION OF NEW YORK APPARATUS ECR HEATING ANL COOLING LIaUIIJs` j ,v Application led May 27,

, The present invention relates to an apparatus for heating or cooling liquids and semi-liquids, such as milk and its products which have been condensed or evaporated,

The object of my invention is an apparatus' for cooling or heating liquids which will perform the necessary cooling or heating more efficiently than has been heretofore possible with the combination of a container of substantially circular cross-section at present in use with a surrounding heating or cooling means or element. A more particular object of my invention is to provide a receptacle of such shape and character as to make its removal for necessary repairs to its lining and its replacement by another receptacle, of the same or different material, a matter of simple accomplishment. A further object of my invention is the provision; in combination with the new form of receptacle. and surrounding heating or cooling element, of a stirring device so situatedand rotated with respect to the material to be treated as to remove air, gas, and volatile matter from within the liquid and to prevent the introduction thereof into the same, tothe ultimate improvement of the product being treated.

In the accompanying drawings, Fig. 1 is a vertical section of one' form of my improved apparatus, Fig. 2 a vertical section of the same at right angles to Fig. 1, Fig. 3 a horizontal section on line 3-3 of Fig. k1, Fig. 4 a detail on the line L -4 of Fig. 3, showing one form of outlet from the tank and the manner of its attachment thereto, Fig. 5 a

1926. serial No. 111,965.

enlar ed detail of the upperportion of 1.

Re erring to the drawingsgl indicates aA suitable receptacle or casing-substantially rectangular in cross-section. `As shown, such caslng may consist of an outer ]acket aan inner ]acket Z2 and an msulating filling, for

instance, acork, c, 2 isany inner receptacley ork tank substantially square in horizontal cross-l section, constructed preferably ,of steel lined'. on the interior with a coating of.V glass which.`

may have been applied thereto, Jfor instance,l in liquid form by spraying. v.Thereceptacle,1. may, however, be made of nickel or copper, the inner surface of the latter being tinned. f

This receptacle is provided vwith a stirring.y devlce consisting preferably of two helical tubes 4 and 5, corresponding ends of which v are united respectively by T-shaped head 6, and a head 7 united by hollow central tube 3 vwhich encloses an inner tube 16, so arranged as to serve as a means of conveying to and carrying awayfrom the helical tubes liquid heating or cooling media. 8 is a stufling box provided with packing glands 9 and two out# let openings 10 and 1l adapted to receive inlet and outlet pipes 12 and 13 respectively;

(See Fig. 10.) The stuffing box 8 is provided l with two annular. channels 14, 15. The packing gland 9 is suitably apertured to permit communication between opening 10 and channel 14 and the interior of the stuting box. The tube 3 enters the lower portion of the stuffing box and is suitably apertured to permit communication between openings 11 and channel 15 and the interior of the-stutiing box. The other end of tube 3 enters head 7 and is suitablyapertured to permit communicationl between its interior and the two helical coils 4 and 5. The outer tube 3 surrounds the inner tube 16 and is spaced therefrom by the heads 18 and 19 which, togetherl I with said inner tube, form c omplete closures,V

so that fluid flowing through said inner tube cannot pass into said outer tube except by first flowing through hollow shaft l3 and the helical tubes 4 and 5. The stufling box 8is carried by casting 2O with which Yit may be integral, the casting rotatably supporting a shaft 21 having at one end a pinion 22 and at the other pulleys 23 or other suitable driving -mechanism,fthe pinion meshing with gear 24, `which is suitably attached to tube 3 adapted to rotate the saine.

and

The stirring mechanism and associated parts are constructed and operated substantially in the manner of similar parts of thc apparatus shown in the United States Letters Patent to Jensen, No. 924,233, dated June 8, 1909, and no claim of novelty is made herein broadly with respect to such stirringr mechanism and associated parts.

Y The tank 2 is preferably provided with au exteriorly extending flange by means of which it cany be supported upon and attached to the upper rim of casing l. Upon such fiange rests a bridge 29 having hinged thereto covers 31,v 31 which, when raised, permit accesstobe had to the interior-of the tank tom outlet, so Well known that it needs no de-y tailed description which I prefer to use Whenever circumstanchs permit. This form of outlet offers a distinct advantage 4over the outlet shown in Fig. 4 as it does'not furnish a pocket in which the milk, or other substance treated, may stagnate. *y

VAs shown in Fig. l, the casing l may be provided with an outlet pipe and as shown in 'Fig 2 with an inlet'pipe 35, so much of the latter as lics Within 'the casino' heinfr )referably perforated. The heating or cooling medium may be introduced through pipe 36,-

( pass upwardlyinto and through the chainber lying between the inner jacket 7) and the tank 2 andpass outthrough pipe 35. In order to secure a `proper distribution of such medium Within the chamber, the tank2 may be provided with a spiral flange 3T (see particularly Fig. 6) which tiange may serve also as a spacing member betWecnt-he tank and casing. Inlay.A hoivcver, introduce the medium to [the chamber through a pipe 38, perforated at suitable intervals along its lower portion (as shown in Fig. 7), and extending around theV entire tank 2 preferably ypist below fianve 25. `Then this )i e is used thc D 3 spiral fiange 37 should not be employed but instead thereof,l use'vertica'lly extending .flanges 39 as shown in Fig'. 7, servingasspacing membersI and suitably aperture-d at or near the top to receive the perforated pipe 38.

VInstead of the stirring device shown in Figs. 1, 2 and 3, provided with helical tubes,

I may use, under certain conditions, a stirring device such as shown in Figs. 8 and 9 in which the helices 40, 4l are not tubular.

The operation of the apparatus is as follows:

The liquidto be treated (heated, cooled, agitated. standardized, neutralized.ripened, or mixed) is placed into tank 2 and the heating or cooling medium, as the case may be, for instance hot or cold water or brine, is introduced through tube l2 whence it flows through opening l0 into the interior of the stuffing box 8, through pipe 16 and the vertical ,hollow tube 8 and then. through head 6 into helical tubes 4 and 5, thence through head 7 into the passage between tube 16' and tube 3. and out through opening 11 into tube 13 in the manner described in United States Letters Patent. No. 924,233 hereinabove referred to. As the heating or cooling medium passes through the helical coils, the stirrer is rotated bymcans of gears 22, 24. At the same time a heatingr or cooling medium, as the case may be. is introduced through perforated pi pc 36 filling the chamber formed between the casing l and tank 2, and after` performing Vthe heating or cooling, passes out through thc outlet If the construction shown in Fig. 7 is employed` the heating or cooling medium is introduced through perforated pipe 38 and flows along thc outer Walls of tank 2, passing out through the bottoni of casing l by any suitable opening. If for any reason it is not desired to effect a rapid change in the temperature ofthe material to be treated, I may substitute for the tubular stirrer the, stirrer shown in Figs. S and 9 for which, of course, I need not provide any of the parts carriedv by thc casting 20 as shown in Fig. lO, Vexcept the gear 24, shaft 2l, pinion 22 and pulley 23.

Itis, of course, obvious that as the function of the casing lis primarily to form one Wall of the chamber lying between itself and tank 2, to permit the application of a fiuid heat-y ing (ir-cooling medium to the latter, any other device for affecting a changent temperature in tank 2 ou its outside would be therequivalent of such container or chamber. Thus a coil of coolingV pipes or an electrical heating coil might be 'employed for respectively cooling or heating the exterior of the tank 2.

When operating the stirrers, shown in Figs. 1 and 8. I do this preferably in a clock-Wise direction viewed from the top as I have found that by so doing I lift out of the material to be treated', particularly milk, the air oceluded therein, whereas by rotating in the opposite direction there is liability of introducing .air into such material. v

Itis not essential that the stirrer should be provided with tivo helices 4 andY 5 or 40, 4l.

VOnly Vone such helix need be employed, ifV 13m circumstances Warrant.

' ing motion and permit an upward or down-l I do not claim to be the first to provide a square tank with helical stirrers such as shown in the drawings. Such an apparatus has been in public use in this country for some years; nor do Il claim to be the first to provide a circular tankwith such stirrers and with an exterior heating chamber, as such an apparatus has also been in public use for a number of years. I do, however, claim to be the first to provide a square tank with a helical stirrer' and exterior heating or cooling means. The use of a square tank 2, presents various marked advantages over the use of a circular tank. It permits more economical use for floor space because, with a stirrer of'the same size it makes it possible to treat@ larger amount of liquid material vthan does a circular tank. Itv permits more ready access for cleaning the tank as the 4usual siz'e of stirrer and circular tank is such that if the tank beA portant that the milk should circulate freely so that if it be heated,no portion thereof be subjected to the danger of scalding or burning and if it be cooled, that the cooling be uniform i`n order to preventincubation of bacteria in any portion thereof, and, therefore, the use of a square tank, affording, in its corners, pockets in which the material might remain substantially motionless for a long time, seemed contraindicated. I have found `however that contrary to expectation the use of the helical coils creates a strong circulation' in such corners. This circulation was not suggested by the use of round tanks as in such tanks the helices set up a very strong circular motion `which necessitated the use of vertical baffles extending inwardly from the inner Walls of the tank to break up the swirlward circulation. The use of the square tank, as compared with the use of a round tank, whose diameter is the same as the length of a side of the former, not only avoids .the necessity of the use of the interior baffles but produces a more gentle circulation of the material to be treated and a more rapid freeing of the contained air by the helices.

While, so far as I am at present aware, a

tank whose horizontal cross-section forms a square is the best form to use, it is obvious 'that the advantages of my invention may be obtained, even if tov somewhat a lesser degree, if the cross-section were a rhomb or an ob- It would, however, be possible to obtain many of the advantages of my invention by making one pair of Aopposite sides 84 inches long. When I speak in my claims of a Square tank, I include as equivalents such tanks Whose horizontal cross-sections are substantially rhombs or oblongs.

I claim: y

1. In an apparatus of the character described, in combination, a square tank, a container surrounding the same,a hollow helical stirrer Within the tanln'means for rotatin the stirrer, a pi e for leading a fluid to an a pipe for leadlng the fluid away from the interior of the stirrer, said stirrer being operative to cause a liquid in said square tank to flow in a substantially upward direction adjacent tothe walls of said tank, means for conducting afluid to the upper portion of said container and for withdrawing such .fluid from the bottom thereof, and flanges arranged in said container to cause circulation of said fluid in said container in a downward direction, whereby said liquid and said fluidy travel in counter-current relationship and rapid and eilicient heat interchange therebetween is promoted.

2. In an apparatus of the character described, in combination, a square tank, a container surrounding the same, a helical stirrer within the tank, means for rotating the stirrer, whereby circuation of liquid in said square tank adjacent to the walls of such tank is induced, and means for causing circulation of a fluid in said container' in a direction lcounter to the flow of said liquid adjacent to said walls,'whereby a rapid and eflicient heat interchange between said liquid and fluid is promoted.

FRITZ G. CORNELL, JR. 

